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7.8
HIGH CVSS 3.1
CVE-2026-72350
netfilter: xt_u32: reject invalid shift counts
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_u32: reject invalid shift counts u32_match_it() executes rule-supplied shift operands on a 32-bit value. A malformed u32 rule can provide a shift count of 32 or more, triggering an undefined shift out-of-bounds during packet evaluation. Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in u32_mt_checkentry() and reject malformed rules before they reach the packet path.

Details
INFO

Published Date :

Aug. 15, 2026, 6:22 a.m.

Last Modified :

Aug. 17, 2026, 6:18 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-72350 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Validate shift operands in u32_mt_checkentry() to reject malformed rules.
  • Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands.
  • Reject malformed rules before packet processing.
  • Update the Linux kernel to the latest version.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-72350.

URL Resource
https://git.kernel.org/stable/c/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29
https://git.kernel.org/stable/c/0a8b7a6d763775709c601f584e709ae48bcc000a
https://git.kernel.org/stable/c/64cdf7d30ac18e43df6c48004435febb965809a8
https://git.kernel.org/stable/c/728f479dc0447ae7eaef87926ff49142e415a811
https://git.kernel.org/stable/c/a597a722fb71a534138c20359b655726622b5f17
https://git.kernel.org/stable/c/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382
https://git.kernel.org/stable/c/ca7c92d9701249e6daf132087756a88cbf2bb2a3
https://git.kernel.org/stable/c/cce42014415cecd98aa49b3950e7b02ee7c81268
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-72350 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-72350 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-72350 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-72350 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'ca7c92d9701249e6daf132087756a88cbf2bb2a3', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'b33b44250d57ab0e5a1e2571b5285fb0d0a7f382', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '728f479dc0447ae7eaef87926ff49142e415a811', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '0a8b7a6d763775709c601f584e709ae48bcc000a', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'cce42014415cecd98aa49b3950e7b02ee7c81268', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'a597a722fb71a534138c20359b655726622b5f17', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '00d034fe8230dfc5832fe011ff2d81c1a2cc7a29', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '64cdf7d30ac18e43df6c48004435febb965809a8', 'versionType': 'git'}], 'programFiles': ['net/netfilter/xt_u32.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.23'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.23', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/xt_u32.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'ca7c92d9701249e6daf132087756a88cbf2bb2a3', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'b33b44250d57ab0e5a1e2571b5285fb0d0a7f382', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '728f479dc0447ae7eaef87926ff49142e415a811', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '0a8b7a6d763775709c601f584e709ae48bcc000a', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'cce42014415cecd98aa49b3950e7b02ee7c81268', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'a597a722fb71a534138c20359b655726622b5f17', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '00d034fe8230dfc5832fe011ff2d81c1a2cc7a29', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '64cdf7d30ac18e43df6c48004435febb965809a8', 'versionType': 'git'}], 'programFiles': ['net/netfilter/xt_u32.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.23'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.23', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/xt_u32.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 15, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'ca7c92d9701249e6daf132087756a88cbf2bb2a3', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'b33b44250d57ab0e5a1e2571b5285fb0d0a7f382', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '728f479dc0447ae7eaef87926ff49142e415a811', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '0a8b7a6d763775709c601f584e709ae48bcc000a', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'cce42014415cecd98aa49b3950e7b02ee7c81268', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': 'a597a722fb71a534138c20359b655726622b5f17', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '00d034fe8230dfc5832fe011ff2d81c1a2cc7a29', 'versionType': 'git'}, {'status': 'affected', 'version': '1b50b8a371e90a5e110f466e4ac02cf6b5f681de', 'lessThan': '64cdf7d30ac18e43df6c48004435febb965809a8', 'versionType': 'git'}], 'programFiles': ['net/netfilter/xt_u32.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.23'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.23', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.261', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/xt_u32.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_u32: reject invalid shift counts u32_match_it() executes rule-supplied shift operands on a 32-bit value. A malformed u32 rule can provide a shift count of 32 or more, triggering an undefined shift out-of-bounds during packet evaluation. Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in u32_mt_checkentry() and reject malformed rules before they reach the packet path.
    Added Reference https://git.kernel.org/stable/c/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29
    Added Reference https://git.kernel.org/stable/c/0a8b7a6d763775709c601f584e709ae48bcc000a
    Added Reference https://git.kernel.org/stable/c/64cdf7d30ac18e43df6c48004435febb965809a8
    Added Reference https://git.kernel.org/stable/c/728f479dc0447ae7eaef87926ff49142e415a811
    Added Reference https://git.kernel.org/stable/c/a597a722fb71a534138c20359b655726622b5f17
    Added Reference https://git.kernel.org/stable/c/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382
    Added Reference https://git.kernel.org/stable/c/ca7c92d9701249e6daf132087756a88cbf2bb2a3
    Added Reference https://git.kernel.org/stable/c/cce42014415cecd98aa49b3950e7b02ee7c81268
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact